West Sussex · England
Sand mastic for sash & case windows in North Mundham, West Sussex
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for North Mundham, backed by a one-year guarantee. Ask us for a quote.
- Cracked mastic round a front door frame
- Window mastic to renew ahead of painting
- Patchy fillers round a sash window
Sand mastic in North Mundham, done properly
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It suits period and listed homes where a modern sealant bead would stand out. Typical jobs include wind and rain getting in round a sash window and cracked mastic round a front door frame, across period & listed homes, stone surrounds and timber door frames.
Mastic can only go onto a dry, clean joint, so window work in North Mundham is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Each job carries a 12-month guarantee, large or small.
- Location
- North Mundham (PO20)
- Region
- West Sussex
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Get any rot dealt with first
- Inspect the joints round the windows every year or so
- Keep sills and gutters clear so water drains away
- Ask us before painting near the mastic
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens as more mastic falls out.
Why it’s worth doing now in North Mundham
If you’re redecorating, renew the mastic first. Paint over cracked mastic won’t stop the gaps, and the new mastic is traditionally left unpainted. Older cottages and farmhouses around North Mundham can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we’ll go through it with you.
What you get with us
- Every job guaranteed for a year
- Anti-fungal sanitary silicone in wet areas
- Neat joints and a tidy finish
- An ARBOMaster approved applicator
See our cost guide or our reviews.
Windows and doors in North Mundham
North Mundham is within about 3 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. With historic houses such as Goodwood House (about 4 miles north) nearby, there’s older building stock in the area around North Mundham as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Letting a property close to Chichester station? Then older sash windows in a rental need their mastic kept sound to keep the weather out. Managing a site like North Mundham Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
North Mundham is about 2 miles south-east of Chichester, in West Sussex. Every kind of property in North Mundham is covered for sand mastic, old or new, large or small. The work is guaranteed for a year. We cover 371 towns and villages across West Sussex, from the larger towns to small villages. We also work in Portsmouth, around 14 miles away.
Here we cover the PO20 postcode area for sand mastic. If you need sand mastic at a property on Church Road, Fletcher Place and Palmer Place or anywhere close by, our applicators can take on the job. We also cover Runcton (1 mile east), Hunston (1 mile west), Merston (1 mile east), Donnington (1 mile west) and Lagness (2 miles south-east). We also work in nearby towns such as Bognor Regis (4 miles south-east), Selsey (6 miles south), Littlehampton (10 miles east), Emsworth (8 miles west), Rustington (11 miles east) and Storrington (15 miles north-east).
Landmarks near North Mundham
In North Mundham, that means homes and buildings near The Spotted Cow Public House and Chichester High School For Girls. North Mundham’s nearest station is Chichester station, roughly 1.6 miles north-west of the centre. Well-known places in the area include St Richard's Hospital (2.1 miles north) and Chichester Cathedral Treasury (1.8 miles north-west).
North Mundham questions
Do you work for landlords with property near Chichester station?
Yes, we work for landlords and agents. Just call 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Does living near the coast affect sand mastic in North Mundham?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
What should I tell you?
A short description and the location. We will ask anything else we need to know.
Should I use sand mastic or silicone?
It depends on the window. Period windows in stone or brick usually suit sand mastic and newer frames usually get a flexible sealant.
Can you seal over the old sealant?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
What is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
Can you match the sealant colour?
Normally, yes. Sealants come in white, clear, grey and other colours for many products, and we’ll agree it with you first.
Is consent needed for window work on a listed home?
Check with your local planning authority. They’ll tell you if consent is needed for work to your windows.
The process
Once we’re on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours per window, depending on the condition of the joints. For a village or hamlet like North Mundham, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
How to prepare
- Mention any tricky access
- Tell us if parking is tricky
- Tell us about any previous sealing or DIY attempts
Getting a quote
To get a quote, ring 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
Related advice
Landlords, agents and businesses in North Mundham
If you manage several properties in or around North Mundham, several properties can go on one quote. Just tell us the addresses and what each one needs.
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
Honest limits
We will not take on work that will not last, so here’s what sealant cannot put right:
- Decisions on consent for listed homes
- Putty and glazing repairs
- Sashes that need overhauling
If you’re not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer before booking.
Where we work in North Mundham
- Stone surrounds
- Timber door frames
- Sash and case windows
- Tenement windows
- Period & listed homes
- Brick reveals
Places near North Mundham
More services for North Mundham
Signs you need sand mastic in North Mundham
Over the years, sand mastic weathers. It hardens, cracks and starts to come away from the frame or the masonry.
Look out for any of the following:
- Patchy fillers round a sash window
- Gaps between timber frames and stone or brick
- Tired mastic found when preparing windows for paint
- Draughts and rain around sash boxes
For an older house near a landmark such as The Parish Church of St Stephen, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before you book anyone
- What guarantee comes with the work
- Whether the sealant suits the joint
- Who does the work, and how experienced they are
- Whether they seal over old material or remove it
What affects the cost of sand mastic
We quote each job individually. These are the things that affect it:
- How easy the joints are to reach
- Mould in or behind the old joints
- How much there is to do
- Which sealant suits the joint
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
What we need to know
To make quoting easier, let us know:
- A few photos by email, if you can
- The problem you’ve noticed
- How we’d reach the joints
- Any previous sealing or DIY work
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.